feat: spec + repo

src/request.persistence/_expressions/WhereExpressionInfo.cs

@@ -0,0 +1,38 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using System.Linq.Expressions;
+
+namespace Geekeey.Request.Persistence;
+
+/// <summary>
+/// Stores information about a where expression.
+/// </summary>
+/// <typeparam name="T">The entity type.</typeparam>
+public sealed class WhereExpressionInfo<T>
+{
+	private readonly Lazy<Func<T, bool>> _filterFunc;
+
+	/// <summary>
+	/// Creates a new where expression info.
+	/// </summary>
+	/// <param name="filter">The filter expression.</param>
+	public WhereExpressionInfo(Expression<Func<T, bool>> filter)
+	{
+		ArgumentNullException.ThrowIfNull(filter);
+
+		Filter = filter;
+
+		_filterFunc = new Lazy<Func<T, bool>>(Filter.Compile);
+	}
+
+	/// <summary>
+	/// Gets the filter expression.
+	/// </summary>
+	public Expression<Func<T, bool>> Filter { get; }
+
+	/// <summary>
+	/// Gets the compiled filter function.
+	/// </summary>
+	public Func<T, bool> FilterFunc => _filterFunc.Value;
+}